Recursion error when using webpack 4

[Flamenco]

see webpack/webpack#6026

Webpack has issues when package.json uses "main": "./".

Workaround without changing node-querybuilder source:

module.exports = {
  resolve: {
    alias: {
      // see https://github.com/webpack/webpack/issues/6026
      'node-querybuilder': 'node-querybuilder/index.js',
    },
  }
}